In my modification i create a GL journal from code with multiple lines and iterate over it later (ledgerJournalTrans) and need to settle all of its transactions, so i can iterate over all ledgerJournalTrans and as i understand it must have a relation between those two tables becouse it can be done manually in GL Line -> Functions -> Settlement -> vendTrans line -> OK -> its back to GL line and updates corresponding one, so i understand it must have a relation :)